Oaks of the World

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  Quercus edithiae
Author Skan 1901 Hooker's Icon. Pl. 27: t. 2661
Synonyms Cyclobalanopsis edithiae (Skan) Schottky 1912
tephrosia Chun & W.C.Ko 1958
Local names hua nan qing gang;
Range China (Hainan, Guangdong, Guangxi ), Vietnam; 400-1800 m ;
Growth habit usually 9-10 m, but reaches 20 m;
Leaves 7-15 x 3-6 cm; coriaceous; elliptical to oblong-elliptic; apex caudate, obtuse; base cuneate; crenate-denticulate in the apical 2/3; glabrous and shiny above; at first reddish-brown pubescent, then mature leaves hairless beneath; midrib flat above; 8-11 vein pairs raised beneath; tertiary veins evident abaxially; petiole 2-3 cm, glabrous;
Flowers female inflorescence 1-2 cm, bearing 2-3 flowers;
Fruits acorn 4-4.5 cm long, 2-2.5 cm wide; pointed, ellipsoid to cylindrical-ellipsoid, tomentose; singly or in pairs; enclosed 1/4 to 1/3 by cup; cup bowl-shaped, 1.5-1.7 cm long, 2.3 cm wide, 2-3 mm thick, tomentose both inside and outside, with 6-8 concentric rings, margin denticulate except 2-3 basal rings that are entire; scar 7 mm in diameter, slightly convex; stylopodium persistent, puberulent; maturing in 1 year;

Bark, twigs and

twigs remotely angled, rusty tomentose becoming glabrous; 2-year-old branchlets with small scattered lenticels; bud ellipsoid to ovoid; stipules deciduous;
Hardiness zone, habitat not hardy; in evergreen broadleaves forests, in mountains;
Miscellaneous -- A.Camus : tome 1, p. 196, n° 9;
-- Flora of China n° 38;
-- Sub-genus Cerris, Section Cyclobalanopsis;
-- Section Semiserrata, sub-section Semiserratae (Menitsky).
-- Threatened (IUCN Red List Category : EN).

-- Similar to
Q.semiserrata (but differs in having larger and thinner acorns, and leaves always obtuse);
-- Written sometimes "edithae";

Subspecies and